Tc78 vs pt88
10-22-2010, 04:47 PM
#1
TECH Addict
Thread Starter
iTrader: (36)
Join Date: Apr 2002
Location: Murphy, Tx
Posts: 2,526
Likes: 0
Received 0 Likes
on
0 Posts
Tc78 vs pt88 Okay I have a tc78 .96ar currently. The motor is a 402 ls2. I keep seeing threads bout too much back pressure. So I'm thinking bout the pt88. But it has the same exhaust size exhaust housing. But I'm thinking I could make more power with it than the tc78. Would it be beneficial to make the swap? Both are t4s.
10-22-2010, 04:59 PM
#3
On The Tree
iTrader: (11)
Join Date: Jun 2005
Location: Left Texas, now in Camarillo, CA
Posts: 140
Likes: 0
Received 0 Likes
on
0 Posts
Go PT80 or PT88. The exhaust a/r ratio is the same but the PT's have bigger turbine wheels and will flow more than the TC78.
I run a PT80 Rearmount on my '98 Vette 408 and just confirmed a 2 to 1 ratio of backpressure to boost. At 9.5# of boost I had 20# of backpressure just before the turbo inlet. At 14# of boost I had 30# of backpressure.
So, I think anything smaller for a turbine wheel is gonna choke a 400+ cid motor. Just my .02
I run a PT80 Rearmount on my '98 Vette 408 and just confirmed a 2 to 1 ratio of backpressure to boost. At 9.5# of boost I had 20# of backpressure just before the turbo inlet. At 14# of boost I had 30# of backpressure.
So, I think anything smaller for a turbine wheel is gonna choke a 400+ cid motor. Just my .02
10-22-2010, 05:20 PM
#4
10 Second Club
iTrader: (27)
Join Date: Sep 2008
Location: Lake Tapps, WA
Posts: 2,229
Likes: 0
Received 0 Likes
on
0 Posts
I had a similiar question and was told by Jose at Forced Induction that you can't compare A/R numbers between turbos unless it's within the same family of turbo. In comparision my ST80 with a 1.1 a/r has less backpressure than my old TC76 with a 1.15a/r
Trending Topics
10-22-2010, 05:49 PM
#8
TECH Addict
Thread Starter
iTrader: (36)
Join Date: Apr 2002
Location: Murphy, Tx
Posts: 2,526
Likes: 0
Received 0 Likes
on
0 Posts
At the moment very space limited. The car is a 98 TA. Really just want a really fast street car I can enjoy and push it a little whenever I have the urge. Oh and it's a t56 at the moment.
10-22-2010, 10:43 PM
#9
Banned
iTrader: (4)
Join Date: Jul 2010
Location: Texas
Posts: 352
Likes: 0
Received 0 Likes
on
0 Posts
https://ls1tech.com/forums/forced-in...ron-346-a.html
check that out its still not tuned all the way so no numbers
check that out its still not tuned all the way so no numbers
